2259781638 has 8 divisors (see below), whose sum is σ = 4519563288. Its totient is φ = 753260544.

The previous prime is 2259781637. The next prime is 2259781639. The reversal of 2259781638 is 8361879522.

It is an interprime number because it is at equal distance from previous prime (2259781637) and next prime (2259781639).

It is a sphenic number, since it is the product of 3 distinct primes.

2259781638 is an admirable number.

It is a super-2 number, since 2×2259781638² = 10213226102883926088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2259781637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188315131 + ... + 188315142.

It is an arithmetic number, because the mean of its divisors is an integer number (564945411).

Almost surely, 2^2259781638 is an apocalyptic number.

2259781638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2259781638 is a wasteful number, since it uses less digits than its factorization.

2259781638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376630278.

The product of its digits is 1451520, while the sum is 51.

The square root of 2259781638 is about 47537.1606009446. The cubic root of 2259781638 is about 1312.2668515028.

The spelling of 2259781638 in words is "two billion, two hundred fifty-nine million, seven hundred eighty-one thousand, six hundred thirty-eight".